老师给的Java问题要在BlueJ 上面做，求大神

Question

不需要都写，能不能帮我整理大概，然后就写出 Enter 1 时候的method就行了
不需要都写，能不能帮我整理大概，然后就写出 Enter 1 时候的method就行了
非常感谢

是这个样子的， 真的刚入门，超新手，救救孩子吧
import java.util.*;

public class CoordinateMath {

//Write your methods here
//
//
//

public static void main(String[] args) {

   //Initialize the variables that will be filled in by the user
    double x1 = 0;
    double y1 = 0;
    double x2 = 0;
    double y2 = 0;

    int userChoice = -1;

    //Gather User Input
    System.out.println("This program can calculate a lot of information based upon two points (x1,y1) & (x2,y2)");

    Scanner in = new Scanner(System.in);

    System.out.println("What is the location of x1? ");
    x1= in.nextDouble();

    System.out.println("What is the location of y1? ");
    y1= in.nextDouble();

    System.out.println("What is the location of x2? ");
    x2= in.nextDouble();

    System.out.println("What is the location of y2? ");
    y2= in.nextDouble();

    System.out.println(" ");

    //Start calling Methods based upon user input

    while(userChoice != 0){

    System.out.println("\nWhat would you like to calculate given these two points?");
    System.out.println("Enter 1 to have your two points re-printed.");
    System.out.println("Enter 2 to locate the midpoint between the two given points.");
    System.out.println("Enter 3 to calculate the distance between your two points.");
    System.out.println("Enter 4 to calculate the slope of the line connecting the two points.");
    System.out.println("Enter 5 to calculate the Y intercept of the line connecting the two points.");
    System.out.println("Enter 6 to calculate the equation of your line in Slope Intercept form.");
    System.out.println("Enter 7 to find the quadrant for point 1.");
    System.out.println("Enter 8 to find the quadrant for point 2.");
    System.out.println("Enter 9 to quit");
    userChoice = in.nextInt(); 

    // If 1 call a method that re-displays the location of the points based upon the user input


    // If 2 call a method that displays the midpoint 


    // If 3 call a method that that displays distance between the two points


    // If 4 call a method that displays the slope of the line that connects the two points

    // If 5 call a method that displays the Y Intercept the line


    // If 6 call a method that displays the equation of the line in slope intercept form y=mx+b


    // If 7 call a method that displays the quadrant of point 1.


    // If 8 call a method that displays the quadrant of point 2.


  }

 System.out.println("Thank you for using my coordinate program.  Good bye.");
}

}

Answer 1

问题比较多
userChoice = in.nextInt();
这里加上
switch (userChoice)
{
case 1:
重新显示点的坐标
break;
case 2:
...
}
按照这个写就可以了。